38 twobyte_memmem(const unsigned char *h, size_t k, const unsigned char *n)  in twobyte_memmem()  argument
40 	uint16_t nw = n[0]<<8 | n[1], hw = h[0]<<8 | h[1];  in twobyte_memmem()
41 	for (h+=2, k-=2; k; k--, hw = hw<<8 | *h++)  in twobyte_memmem()
47 threebyte_memmem(const unsigned char *h, size_t k, const unsigned char *n)  in threebyte_memmem()  argument
49 	uint32_t nw = n[0]<<24 | n[1]<<16 | n[2]<<8;  in threebyte_memmem()
50 	uint32_t hw = h[0]<<24 | h[1]<<16 | h[2]<<8;  in threebyte_memmem()
51 	for (h+=3, k-=3; k; k--, hw = (hw|*h++)<<8)  in threebyte_memmem()
57 fourbyte_memmem(const unsigned char *h, size_t k, const unsigned char *n)  in fourbyte_memmem()  argument
59 	uint32_t nw = n[0]<<24 | n[1]<<16 | n[2]<<8 | n[3];  in fourbyte_memmem()
60 	uint32_t hw = h[0]<<24 | h[1]<<16 | h[2]<<8 | h[3];  in fourbyte_memmem()
61 	for (h+=4, k-=4; k; k--, hw = hw<<8 | *h++)  in fourbyte_memmem()
73  ((a)[(size_t)(b)/(8*sizeof *(a))] op (size_t)1<<((size_t)(b)%(8*sizeof *(a))))
83 	size_t i, ip, jp, k, p, ms, p0, mem, mem0;  in twoway_memmem()  local
89 		BITOP(byteset, n[i], |=), shift[n[i]] = i+1;  in twoway_memmem()
92 	ip = -1; jp = 0; k = p = 1;  in twoway_memmem()
93 	while (jp+k<l) {  in twoway_memmem()
94 		if (n[ip+k] == n[jp+k]) {  in twoway_memmem()
95 			if (k == p) {  in twoway_memmem()
97 				k = 1;  in twoway_memmem()
98 			} else k++;  in twoway_memmem()
99 		} else if (n[ip+k] > n[jp+k]) {  in twoway_memmem()
100 			jp += k;  in twoway_memmem()
101 			k = 1;  in twoway_memmem()
105 			k = p = 1;  in twoway_memmem()
112 	ip = -1; jp = 0; k = p = 1;  in twoway_memmem()
113 	while (jp+k<l) {  in twoway_memmem()
114 		if (n[ip+k] == n[jp+k]) {  in twoway_memmem()
115 			if (k == p) {  in twoway_memmem()
117 				k = 1;  in twoway_memmem()
118 			} else k++;  in twoway_memmem()
119 		} else if (n[ip+k] < n[jp+k]) {  in twoway_memmem()
120 			jp += k;  in twoway_memmem()
121 			k = 1;  in twoway_memmem()
125 			k = p = 1;  in twoway_memmem()
128 	if (ip+1 > ms+1) ms = ip;  in twoway_memmem()
132 	if (memcmp(n, n+p, ms+1)) {  in twoway_memmem()
134 		p = MAX(ms, l-ms-1) + 1;  in twoway_memmem()
144 		if (BITOP(byteset, h[l-1], &)) {  in twoway_memmem()
145 			k = l-shift[h[l-1]];  in twoway_memmem()
146 			if (k) {  in twoway_memmem()
147 				if (k < mem) k = mem;  in twoway_memmem()
148 				h += k;  in twoway_memmem()
159 		for (k=MAX(ms+1,mem); k<l && n[k] == h[k]; k++);  in twoway_memmem()
160 		if (k < l) {  in twoway_memmem()
161 			h += k-ms;  in twoway_memmem()
166 		for (k=ms+1; k>mem && n[k-1] == h[k-1]; k--);  in twoway_memmem()
167 		if (k <= mem) return (char *)h;  in twoway_memmem()
174 memmem(const void *h0, size_t k, const void *n0, size_t l)  in memmem()  argument
182 	if (k<l) return 0;  in memmem()
185 	h = memchr(h0, *n, k);  in memmem()
186 	if (!h || l==1) return (void *)h;  in memmem()
187 	k -= h - (const unsigned char *)h0;  in memmem()
188 	if (k<l) return 0;  in memmem()
189 	if (l==2) return twobyte_memmem(h, k, n);  in memmem()
190 	if (l==3) return threebyte_memmem(h, k, n);  in memmem()
191 	if (l==4) return fourbyte_memmem(h, k, n);  in memmem()
193 	return twoway_memmem(h, h+k, n, l);  in memmem()